Plug sealing means for metallic containers



May 18, 1937. L. B. WACKMAN PLUG SEALING MEANS FOR METALLIC CONTAiNERS Filed Feb. 6, 1929 Patented May 18, 1937 UNITED STATES PATENT OFFICE PLUG SEALINg mums son METALLIC on'ramnns 1 Application February 6, 1929, Serial No. 387,815

2 Claim.

This invention relates to an improvement in a plug sealing means for metallic containers and the like and has for its primary object the purpose of providing a means of obstruction which must be destroyed for removal of the plug from the bushing of the container before the contents of the container can be removed.

Another object of the invention is to provide a plug sealing means for the closure plug of a container for obstructing undetectable access to the plug for the removal thereof.

A further object of the invention is to provide a sealing means for the closure plug of a container in the form of a cap which is adapted to cover the closure plug and the bushing in which the plug is secured and the bushing provided with means which are cooperable with the cap for securing the cap thereto.

Other and further objects will appear in the specification and be specifically pointed out in the appended claims, reference being had in the accompanying drawing, exemplifying the invention, and in which:-

Figure 1 is a view illustrating the invention as applied to the plug and bushing and showing the bushing secured in the wall of a metallic container, a portion of the container wall being shown in section. t

Figure 2 is a plan view partly in section taken approximately on the line II-II of Fig. 1.

Figure 3 is a transverse vertical section taken on the line 111-111 of Fig, 2.

Referring .by numerals to the accompanying drawing I designates a wall of a metallic container such as is used in oil shipping, and formed in said wall as a counter-sunk portion 2 forming an embossment and formed concentrically in the portion 2 is, arropening 3 having a surrounding depending'neck or flange 4.

Mounted in the neck 4 is an interiorly threaded portion 5 of a bushing 8, said bushing having a horizontally disposed flange l whichis seated on the gasket 8 in the counter-sunk portion 2 and extending circumferentially around the flange I is a vertical wall or edge shaving an outwardly disposed annular bead or lip It. The bushing Q,

is held in the neck 4 of the wall I by the out-" wardly flared portion H which underengages the lower edge I? of the neck 4, the annular extremity it of the flared portion il being curled.

against the outside of the neck 4.

For closing the container, a closure plug l4 having circumferential wrench engaging means it and socket wrench engaging means II, is engaged in the threaded portion I of the bushing 4.

the flange portion ll of said plug being engaged against the gasket it which engages against the flange l of the bushing 6. The greatest diameter of the flange ll of the plug I4 is much less then the inside diameter of the bushing 6 provided across the wall 9, thereby providing an annular space or gap around the flat-sided circumferential wrench engaging means ii of the flange ll of they plug M, for permitting overengaging of a socket wrench with the plug.

When a container is filled for shipment and the closure plug I4 is secured in the bushing B as shown in Fig. 3, and it is desired to provide a seal for the plug, a cover cap is having a depending skirt 20 is mounted on the annular wall 8 of the bushing 6 and the skirt 20 of the cap will overengage the annular lip i0 as shown in .Fig. '3. While pressure is brought to bear on the cap I! to hold it againstthe upper edge of the wall 9, a tooling implement is operated on the skirt 20 of the cap for forcing said skirt in underengagement with the annular lip 10 of the wall 8 of. the bushing 6, this operation being the sealing operation for securing the cover cap to the bushing.

The cover cap is is preferably made of a light weight material such as a thin sheet metal which will readily break or tear in tampering in the event that an unauthorized person attempts to pry or move the cover cap from the annular lip Ill, and in the event of any such tampering the same can be readily detected by the receiver of the container after shipment to the receiver has been made.

In the lawful operation of opening the contool can be used for under-engaging and prying the bent edge of the skirt 20 of the cap from under-engagement with the lip 10 of the bushing O for removing the cover cap I! and providing accessibility to the plug l4 for wrench engagement for removing the plug from the bushing 6.

By-the provision of both the circumferential wrench engaging means II and the socket wrench engaging means It on the plug 14, two forms of wrenching tools may be used, for in some instances, the plug may be secured so tightly in the bushing that a wrench engaged in, the socket l4 cannot permit enough force to be applied to the plug for loosening it. The provision of the circumferential wrench engaging means l6 will therefore permit an over-engaging wrench to be applied to. the plug by reason of theannular space between the flange H .oftheplugandthewalll of tbebushing,the

application of the over-engaging wrench permitting greater leverage being applied to the plug for loosening.

Obviously constructional modifications ot the device are possible without departing from the spirit of the present invention and therefore it is to be understood that it is not necessary to limit the invention by the terms used in the foregoing description, excepting such as the state of the art may require. a

What I claim is:-

1. A fitting for a container comprising a bushing having an interiorlythreaded part and an annular wall disposed outwardly of the threads of said part, said wall having a laterally extending annular lip on its extending end, a plug cooperable with said threaded part .01 the bushing having its top wall di posed on a plane inwardly oi the lip and its wrenching end spaced from said annular wall for permitting wrench "engagement over' the perimeter of the wrenching end of the plug, and a cap having a skirt mounted over the extending end or said annular wall and having its skirt contracted over the lip.

2. A fitting for a container comprising a bushing having an interloriy threaded part and an integral annular wall disposed outwardly of the threads of said part, said wall having a laterally extending annular lip formed on the outside thereof at its upper end, a plug cooperable with said threaded part having its top wall disposed below the lip of the annular wall and its wrenching end disposed within the confines of said annular wall and spaced therefrom for permitting wrench engagement over the perimeter of the wrenching end of the plug, and a cap having a skirt mounted over the upper end of said annular wall and having its skirt clinched over said lip.

' LOUIS B. WACKMAN. 

